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C-Band GaN Dual-Feedback Low-Noise Amplifier MMIC with High-Input Power Robustness 具有高输入功率鲁棒性的c波段GaN双反馈低噪声放大器
IF 2.3 3区 工程技术
Journal of electromagnetic engineering and science Pub Date : 2022-11-30 DOI: 10.26866/jees.2022.6.r.137
Hachon Sung, Seong-Hee Han, Seong-Il Kim, H. Ahn, Jong-Won Lim, Dong-Wook Kim
{"title":"C-Band GaN Dual-Feedback Low-Noise Amplifier MMIC with High-Input Power Robustness","authors":"Hachon Sung, Seong-Hee Han, Seong-Il Kim, H. Ahn, Jong-Won Lim, Dong-Wook Kim","doi":"10.26866/jees.2022.6.r.137","DOIUrl":"https://doi.org/10.26866/jees.2022.6.r.137","url":null,"abstract":"In this paper, using the 0.2 μm ETRI GaN HEMT process, we developed a C-band GaN dual-feedback low-noise amplifier MMIC for an RF receiver module that requires high-input power robustness. By applying a feedback microstrip line at the source of the transistor and series resistor-capacitor (RC) feedback between the gate and the drain of the transistor, we obtained stable amplifier operation and a compromised impedance trace for both input impedance matching and noise matching while suppressing performance degradation of the maximum available gain and minimum noise figure. The developed low-noise amplifier MMIC, which implements simple matching circuits by using biasing elements as matching elements, had a linear gain of more than 21.4 dB and a noise figure of less than 1.91 dB in the wide bandwidth of 4.3–7.4 GHz. Under the single-tone power test, the low-noise amplifier MMIC had an output P1dB of 14.3–20.1 dBm, and the two-tone intermodulation distortion measurement exhibited an input third-order intercept point (IIP3) of 2.2–5.6 dBm in the same frequency range as the above.","PeriodicalId":15662,"journal":{"name":"Journal of electromagnetic engineering and science","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46455950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Design of a Wideband Printed Patch Dipole Antenna with a Balanced On-Board Feeding Network 一种具有平衡板载馈电网络的宽带印刷贴片偶极子天线的设计
IF 2.3 3区 工程技术
Journal of electromagnetic engineering and science Pub Date : 2022-11-30 DOI: 10.26866/jees.2022.6.r.132
Jeongmin Cho, T. Lim, Youngwan Kim, H. Choo
{"title":"Design of a Wideband Printed Patch Dipole Antenna with a Balanced On-Board Feeding Network","authors":"Jeongmin Cho, T. Lim, Youngwan Kim, H. Choo","doi":"10.26866/jees.2022.6.r.132","DOIUrl":"https://doi.org/10.26866/jees.2022.6.r.132","url":null,"abstract":"This paper proposes a wideband printed patch dipole antenna with a simple on-board feeding network. The proposed antenna is composed of two dipole radiators, a transmission line, and an on-board feeding network with a chip balun. The dipole radiators are printed on a substrate, and the edges of the radiators are truncated to create a hexagonal shape with wide impedance-matching characteristics. The chip balun is embedded in an RO4003C printed circuit board (PCB) to excite differential feeding to each radiator with a 180° phase difference. The proposed antenna is optimized using a CST Studio full electromagnetic software tool, and it is fabricated and measured in an anechoic chamber. The measured fractional bandwidth for the reflection coefficient below –10 dB is 79.5%, and the proposed antenna has a measured gain of 7.1 dBi at 3.5 GHz.","PeriodicalId":15662,"journal":{"name":"Journal of electromagnetic engineering and science","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43842632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Design of a Terahertz Leaky-Wave Long-Slot Antenna Using Graphene 基于石墨烯的太赫兹漏波长槽天线设计
IF 2.3 3区 工程技术
Journal of electromagnetic engineering and science Pub Date : 2022-11-30 DOI: 10.26866/jees.2022.6.r.131
Ehsan Zarnousheh Farahani, A. Mallahzadeh
{"title":"Design of a Terahertz Leaky-Wave Long-Slot Antenna Using Graphene","authors":"Ehsan Zarnousheh Farahani, A. Mallahzadeh","doi":"10.26866/jees.2022.6.r.131","DOIUrl":"https://doi.org/10.26866/jees.2022.6.r.131","url":null,"abstract":"In this paper, a novel graphene-based leaky-wave antenna is presented. The frequency of the proposed antenna is in the terahertz range, and it is composed of a straight long slot covered with a graphene sheet. To tune the leakage constant along the slot, DC voltage biases are applied using gating pads. A transverse equivalent network model that includes the graphene slot structure is also presented. A design procedure for a lossy structure leaky-wave antenna with an unknown loss value is proposed. The antenna is designed and simulated in HFSS and CST software. An interesting feature of this antenna is the ability to control its radiation characteristics across its entire working frequency range through graphene conductivity tunability with DC voltage bias.","PeriodicalId":15662,"journal":{"name":"Journal of electromagnetic engineering and science","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45934605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Free-Space Two-Tier One-Port Calibration Using a Planar Offset Short for Material Measurement 使用平面偏移的自由空间二层一端口校准（简称材料测量）
IF 2.3 3区 工程技术
Journal of electromagnetic engineering and science Pub Date : 2022-11-30 DOI: 10.26866/jees.2022.6.r.135
Jin-Seob Kang
{"title":"Free-Space Two-Tier One-Port Calibration Using a Planar Offset Short for Material Measurement","authors":"Jin-Seob Kang","doi":"10.26866/jees.2022.6.r.135","DOIUrl":"https://doi.org/10.26866/jees.2022.6.r.135","url":null,"abstract":"The scattering parameters of a material under test (MUT) are prerequisites for characterizing the material parameters of the MUT. This paper describes a free-space two-tier one-port calibration method using a planar offset short as a free-space calculable reflect standard for measuring the scattering parameters of an MUT from the two successive one-port calibrations of a free-space material measurement system without a precise positioning system in free space. The two-tier one-port calibration method is validated by comparing the measurement results with those of the thru-reflect-line (TRL) calibration method for two reciprocal MUTs (glass plates of 2.780 mm and 4.775 mm thickness) in the W-band (75–110 GHz). Good agreement between the measurement results from the two calibration methods demonstrates that the free-space two-tier one-port calibration method using a planar offset short can be a feasible and effective alternative to the conventional free-space two-port calibration methods.","PeriodicalId":15662,"journal":{"name":"Journal of electromagnetic engineering and science","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46281816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optically Transparent Patch Antennas Using Saltwater for WLAN Applications 用于WLAN应用的盐水光学透明贴片天线
IF 2.3 3区 工程技术
Journal of electromagnetic engineering and science Pub Date : 2022-11-30 DOI: 10.26866/jees.2022.6.r.129
T. Nguyen, J. Choi, C. Jung
{"title":"Optically Transparent Patch Antennas Using Saltwater for WLAN Applications","authors":"T. Nguyen, J. Choi, C. Jung","doi":"10.26866/jees.2022.6.r.129","DOIUrl":"https://doi.org/10.26866/jees.2022.6.r.129","url":null,"abstract":"This paper presents the design, fabrication, and measurement of a novel transparent patch antenna using saltwater with high-opticaltransparency applications for wireless local area networks (WLANs) at 2.4–2.5 GHz. The most important reason for using saltwater for transparent antenna applications is its superior average optical transparency (OTav >90%) compared to other typical transparent electrodes, such as indium tin oxide (ITO; OTav >80%) or metal-mesh film (MMF; OTav >60%). This study designs three types of antennas: an antenna with a conductive part made of copper sheet (CS) for both the radiator and ground plane (case 1) to compare the performance with two types of proposed transparent antennas that use saltwater as the conductive parts; an antenna with saltwater for the radiator and MMF for the ground plane (case 2); and an antenna with saltwater for both the radiator and ground plane (case 3). The case 1, case 2, and case 3 antennas have peak gains of 6.87, 4.4, and 1.91 dB, respectively, and have corresponding radiation efficiencies of 93.5%, 62%, and 34%. To the best of our knowledge, this is the first demonstration of a transparent patch antenna using saltwater.","PeriodicalId":15662,"journal":{"name":"Journal of electromagnetic engineering and science","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41357140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Reduced-Size Series-Fed Two-Dipole Endfire Antenna 缩小尺寸的串联馈电双偶极Endfire天线
IF 2.3 3区 工程技术
Journal of electromagnetic engineering and science Pub Date : 2022-09-30 DOI: 10.26866/jees.2022.5.r.123
Heesu Wang, Y. Park, I. Park
{"title":"Reduced-Size Series-Fed Two-Dipole Endfire Antenna","authors":"Heesu Wang, Y. Park, I. Park","doi":"10.26866/jees.2022.5.r.123","DOIUrl":"https://doi.org/10.26866/jees.2022.5.r.123","url":null,"abstract":"The conventional series-fed endfire dipole antenna has a wide impedance bandwidth and is inexpensive to manufacture. However, it has a disadvantage: its size is large because of the large inter-dipole spacing, which is required to satisfy the endfire condition for good antenna radiation characteristics. Here, we propose a two-dipole endfire antenna with a reduced size. The miniaturized endfire antenna was designed using a meander line to reduce the interdipole spacing while ensuring that the endfire condition was satisfied. Furthermore, the overall width of the antenna was reduced using a bent dipole and a corrugated ground plane. The electrical size of the proposed antenna was only 0.33","PeriodicalId":15662,"journal":{"name":"Journal of electromagnetic engineering and science","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45400351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Conical Ground Helical Antenna with Feed-Through Insulator for High-Power Microwave Applications 用于高功率微波应用的带馈通绝缘体的锥形接地螺旋天线
IF 2.3 3区 工程技术
Journal of electromagnetic engineering and science Pub Date : 2022-09-30 DOI: 10.26866/jees.2022.5.r.119
Seung Hun Cha, J. Choi, Jiheon Ryu, H. Kwon, Sangmi Lee, D. Son, Y. Yoon
{"title":"Conical Ground Helical Antenna with Feed-Through Insulator for High-Power Microwave Applications","authors":"Seung Hun Cha, J. Choi, Jiheon Ryu, H. Kwon, Sangmi Lee, D. Son, Y. Yoon","doi":"10.26866/jees.2022.5.r.119","DOIUrl":"https://doi.org/10.26866/jees.2022.5.r.119","url":null,"abstract":"In this paper, a novel helical antenna for high-power microwave is proposed. The proposed antenna is intended to demonstrate improved power handling capacity without any deterioration in matching characteristics, gain, and axial ratio. The proposed antenna with a long helix structure is investigated in order to achieve high gain and a relatively wide impedance bandwidth. By increasing the distance between the helix and the ground plane, an improved power handling capacity is obtained, and the impedance matching problem caused by the proposed method is addressed with the use of a feed-through insulator. In addition, a conical-shaped ground is used to compensate for the gain reduction by increasing the distance between the helix and the ground plane. As a result, the proposed antenna exhibits a gain exceeding 11 dBi and an axial ratio of less than 2 dB within the frequency range of 0.86–1.09 GHz. In addition, its power handling capacity exceeds 50 MW for a 0.7-ns input pulse length in air conditions.","PeriodicalId":15662,"journal":{"name":"Journal of electromagnetic engineering and science","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46108119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Omega-K Algorithm Using Plane Wave Approximation for Forward-Looking Imaging Radar 面向前视成像雷达的平面波逼近Omega-K算法
IF 2.3 3区 工程技术
Journal of electromagnetic engineering and science Pub Date : 2022-09-30 DOI: 10.26866/jees.2022.5.r.124
Byung-Doo Cho, Sung-Il Hong, Kichul Yoon
{"title":"Omega-K Algorithm Using Plane Wave Approximation for Forward-Looking Imaging Radar","authors":"Byung-Doo Cho, Sung-Il Hong, Kichul Yoon","doi":"10.26866/jees.2022.5.r.124","DOIUrl":"https://doi.org/10.26866/jees.2022.5.r.124","url":null,"abstract":"We propose an Omega-K algorithm that uses plane wave approximation for image formation in forward-looking imaging radar (FIRA) with the multi-input/double-output configuration. We assume that each of the transmitting antennas is located at the center of the receiving antenna array by applying a virtual antenna array. Then, we solve numerical equations in an approximation of the plane wave with the direction normal to the antenna array. Finally, we can obtain an image by proceeding with the following steps in order: the matched filtering, Stolt interpolation, two-dimensional inverse fast Fourier transform, phase compensation, image registration, and image merging. The performance of the proposed algorithm is verified through a simulation and a real experiment with neighboring targets. The results show that the proposed Omega-K algorithm with plane wave approximation can be successfully applied to FIRA systems with bistatic synthetic aperture radar configuration.","PeriodicalId":15662,"journal":{"name":"Journal of electromagnetic engineering and science","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42751651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of a Numerical Tablet Model in WLAN Band for SAR Study 用于SAR研究的WLAN波段数值片剂模型的建立
IF 2.3 3区 工程技术
Journal of electromagnetic engineering and science Pub Date : 2022-09-30 DOI: 10.26866/jees.2022.5.r.120
Jisu Lee, A. Lee, Seon-Eui Hong, Hyung-Do Choi, Kyung‐Young Jung
{"title":"Development of a Numerical Tablet Model in WLAN Band for SAR Study","authors":"Jisu Lee, A. Lee, Seon-Eui Hong, Hyung-Do Choi, Kyung‐Young Jung","doi":"10.26866/jees.2022.5.r.120","DOIUrl":"https://doi.org/10.26866/jees.2022.5.r.120","url":null,"abstract":"This research proposes a numerical model for a tablet in the wireless local area network band for specific absorption rate (SAR) study. The design criteria, such as the tablet size, operating frequencies, antenna position, and target 1-g peak spatial-average SAR (psSAR) values in the flat phantom, are determined based on the SAR test reports of tablets distributed in South Korea from 2013 to 2017. An internal antenna is designed in a tablet platform to operate in dual bands of 2,450 MHz and 5,500 MHz. The numerical results illustrate that the 1-g psSAR values of the proposed numerical tablet model are within ±10% of the target values. Moreover, the return loss of the designed tablet model is larger than 10 dB, regardless of flat phantom, while its radiation efficiency is higher than 90% in free space.","PeriodicalId":15662,"journal":{"name":"Journal of electromagnetic engineering and science","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43975734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Free-Space Unknown Thru Measurement Using Planar Offset Short for Material Characterization 自由空间未知通过测量使用平面偏移短材料表征
IF 2.3 3区 工程技术
Journal of electromagnetic engineering and science Pub Date : 2022-09-30 DOI: 10.26866/jees.2022.5.r.122
Jin-Seob Kang
{"title":"Free-Space Unknown Thru Measurement Using Planar Offset Short for Material Characterization","authors":"Jin-Seob Kang","doi":"10.26866/jees.2022.5.r.122","DOIUrl":"https://doi.org/10.26866/jees.2022.5.r.122","url":null,"abstract":"Material characterization requires the proper calibration of a material measurement system. This paper describes a free-space unknown thru measurement method using three independent planar metal offset shorts for calibrating a free-space material measurement system. This method is validated by comparing the measurement results with those of the TRL (thru-reflect-line) measurement method for two glass plates of 2.780 mm and 4.775 mm thickness in W-band (75–110 GHz). This can be an affordable and effective alternative to conventional free-space material measurement methods because the precision fabrication of a planar offset short is more feasible and inexpensive than building a precise positioning system in a free-space material measurement system. One can use this measurement method up to a high-frequency range that the fabrication accuracy of a planar offset short is acceptable.","PeriodicalId":15662,"journal":{"name":"Journal of electromagnetic engineering and science","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41532753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
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